STAT 6202 Chapter 3 2012/2013 4 POPULATION VERSUS SAMPLE An example MANAGEMENT OF A STORE ARE INTERESTED IN THE AVERAGE OF THEIR CUSTOMERS. AS SUCH 40 RANDOMLY SELECTED CUSTOMERS OF THEIR STORE ASKED ABOUT THEIR AGE. o Population: o Sample: o μ : o n = N =xo all customers of the store o the 40 randomly selected customers mean age of all customers of the store : mean age of the 40 randomly selected customers 40 total number of customers of the store

STAT 6202 Chapter 3 2012/2013 8 The weight of all UK men follows a normal distribution with mean 80 and standard deviation 15 Short notation: NORMAL DISTRIBUTION An example BACK TO THE WEIGHT EXAMPLE)15, 80( 2 N